A regular fit, light merino (145-155g/m2) Henley T-shirt with military-grade ribbon slot buttons.

Our 100% pure Merino wool will make your hiking more comfortable by keeping unwanted odors to a minimum.

Not only does it help regulate both temperatures and humidity when you hike, it can also be tumble-dried (maximum 60°C), making it a great piece for long-distance adventures.

From the 2026 model onward, we revised the dyeing process to create a smoother, more even fabric surface. Previous-spec models are now available at a special 20% off price.

*For details, please see “Product Specification Updates.”
*Special offers include previous-spec products, inventory that has been available for a certain period, and products that meet functional standards but do not meet our quality standards for regular items.

Although merino dries more slowly than most synthetic base layers, it keeps you warmer when wet. Instead of prioritizing quick drying and cooling, the new 100% Light Merino series is built around moisture absorption and insulation.

When the temperature changes drastically
Wool is good at maintaining a constant temperature inside the garment, keeping you dry and comfortable even in situations where temperatures can suddenly change.

When worn under an outer shell
Synthetic base layers with low moisture absorption can feel very humid and stuffy. On the other hand, our 100% Merino’s superior moisture absorption properties, will help to keep you dry and comfortable when worn under an outer shell.

When worn for long hours
Synthetic clothes often become smelly relatively early on, even if they are deodorant finished. Wools, on the other hand, naturally eliminate odor when the fabric dries even after being soaked in sweat. This powerful anti-odor performance allows you to keep moving day after day, relatively comfortably without smelling too bad.

When packing capacity is limited
Our Merino wool products can be worn in various situations for long hours without getting too smelly, minimizing the need for extra clothes in your backpack.

Wool base layers are chosen by many hikers for the material’s excellent odor-neutralizing performance. Some say it’s almost odor-free even after a week of heavy hiking, but we’ll let you (and your friends) be the judge of that..

Merino wool helps keep you comfortable by managing moisture inside the layer. It absorbs and releases moisture as conditions change, helping it feel less clammy across a wide range of temperatures.

It also helps regulate temperature year-round—staying more comfortable in the heat while helping retain warmth in the cold. Wool fibers naturally create tiny air pockets in the fabric, adding light insulation while still allowing moisture to escape.

Wool generates a small amount of heat as it absorbs moisture, helping you stay warm even when damp. It also doesn’t collapse when wet, so it keeps trapping air for insulation.

At the same time, it pulls moisture away from your skin into the fibers, helping reduce that cold, clammy feeling and lowering the risk of getting chilled.

Normally, merino wool products cannot be tumble dried, as heat can cause the fabric to shrink or lose its shape. Our proprietary 100% merino wool, however, can be tumble dried* at low temperatures, up to 60°C.

This makes it better suited for long hikes and travel, since you can use dryers at laundromats and hotels with more confidence.

The Merino Henley T-shirt uses military-grade ribbon slot buttons to make sure you won’t accidentally lose a button on the go.

Wool is a natural material with various unique features such as temperature/moisture control, thermal insulation, and is naturally odor-resistant. All are developed by sheep to survive the harsh environment over time.

Merino wool comes from merino sheep and compared to other kinds of wool, merino fiber is finer, softer, and less scratchy, and hence even suitable for making underwear and baselayers.

All wool, including merino wool, is cool in summer and warm in winter. It is warm even when it’s wet, and practically odor-free even after many hours of wear.

While many other manufacturers add synthetic fibers to strengthen their Merino fabrics, we wanted to stick with 100% Merino to maximize the natural benefits of pure merino wool. Our merino will keep you dry even when it’s hot and humid and comfortable no matter the climate.

As explained above, wool or merino wool has various features and functions, but it is not flawless.

• Easily absorbs moisture and becomes heavy
  Wool can get quite heavy as it is great at absorbing moisture. This also means that wool takes longer to dry than synthetic fibers, but compared to cotton, it actually dries faster.

• Liked by insects
  Soft, natural fibers such as wool, cashmere, and silk are prone to damage by insects.

• Easily damaged
  The relatively short fibers of wool mean that wool fabrics are easier damaged than synthetic and cotton fibers. However, small holes can easily be fixed with a bit of pure wool and a needle.

• Shrinks easily
  Wool generally shrinks easily, even when shrink-proofed. To reduce shrinkage, after washing, stretch the shirt to its original shape and gently iron it before drying.

• Distortion
  When knitted wool fabrics are washed, the material is likely to distort diagonally because the yarned fibers absorb water, swell, and tend to untwist. Consequently, the shape of the shirt may distort slightly with washing.

• Distinctive smell
  The wool comes from sheep and you may experience a distinctive animal-like smell coming from your t-shirt when damp. This smell usually disappears after the fabric dries.

The above information was compiled and edited based on the interview with the textile company and the research institute, and the reference book below:

Bibliography:
Structure and Physical Properties of Wool, Japan Wool Industry Association, Seni Co., Ltd.

Due to the nature of the fabric, it may stretch or shrink slightly after washing. The sizing has been adjusted to account for changes in the fabric after washing and drying.

• The measurements above are for the product in its brand-new, unwashed condition.
• Due to the stretch of the knit fabric, individual products may vary by 1–2 cm.
• The degree of size change may vary slightly from product to product due to the nature of the fabric. It may also vary depending on the type of washing machine and wash cycle used.
• Tumble drying on a low-temperature setting may cause the fabric to shrink more than air drying. This can be improved by washing the product again and hang drying it.
• If the fit feels smaller after washing and drying, gently stretching the fabric while applying steam with an iron can help restore it.

• Merino wool can attract moths if body oils build up in the fabric. Wash regularly to help prevent insect damage.
• When storing, use mothballs and keep the item sealed to protect it from insects.
• Yamatomichi’s 100% Merino Wool can be machine-washed on a gentle cycle.
• Due to the short fibers, some pilling or fuzz may appear at first, but this will lessen with washing as loose fibers are removed.